DLSw


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DLSw

(Data Link SWitching) An IBM method for integrating and forwarding SNA and LAN traffic over wide area networks (WANs) by encapsulating the data in TCP/IP packets. DLSw supports the SDLC (SNA) and LLC2 (Token Ring) data link protocols and is generally employed in routers. Multiprotocol over frame relay (MPOFR) is a later technology designed to move SNA and LAN traffic over frame relay. See MPOFR.
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APPN/Boundary Function for DLSw addresses IP Convergence -- The DLSw/APPN boundary function allows users to traverse an IP network while still having access to enterprise-level applications via an APPN/HPR backbone network.
IP Multicast with DLSw Reduces Network Traffic -- As large companies are migrating to an "any-to-any" peer configuration using DLSw, IP Multicast with DLSw improves performance while eliminating overhead.
DLSw provides a reliable method for transporting SNA and NetBIOS traffic across an IP network.
Bay Networks also has extended its DLSw functionality to support PU Type 1 (PU1) devices which are SDLC-attached controllers such as IBM 5294 and 5394 devices.
Bandwidth management within DLSw allows users to give precedence to network traffic based on the requirements of their business, thereby ensuring fast response times for SNA applications even when using a multiprotocol network.
The Multiprotocol Services package includes all of the above plus support for IPX, AppleTalk 2, VINES, DECnet V, OSI and BGP-4, while the Universal Bridge/SNA Services package adds support for DLSw.
Access for Windows' Desktop DLSw supports both versions of the industry-standard DLSw specification, RFC 1795 and RFC 1434, making it highly interoperable.
With Desktop DLSw, Access for Windows is the only PC-to-host connectivity solution to include SNA over TCP/IP connectivity as a standard option," says Maks Wulkan, Eicon Technology's executive vice-president.
As the first industry benchmark to examine SDLC encapsulation using DLSw on IP backbones, The Tolly Group test measured the throughput and response time characteristics of a single vendor SDLC integration with LAN/WAN internetworks.
Enhancements include Advanced Peer-to-Peer Networking (APPN) support for direct transport over Asynchronous Transfer Mode (ATM), Switched Multimegabit Data Service (SMDS) and Integrated Services Digital Network (ISDN); Data Link Switching Plus (DLSw+) enhancements, including SNA dial-on-demand routing (DDR) and DLSw Lite; and Boundary Access Node (BAN) capability.
0, 3Com's DLSw implementation (RFC 1795) delivers a robust, flexible prioritization mechanism which allows network administrators to allocate the percentage of bandwidth which various users will be allowed.
OpenROUTE also includes Proteon's Bandwidth Reservation, MOSPF and award winning DLSw implementation (named Data Communications Magazine's "Hot Product of the Year" in January 1995) to improve the performance and reliability of standards-based internetworks.